Hollow blast-burner for furnaces.



J. B. LEONARD.

HOLLOW BLAST BURNER FOR FURNACES.

APPLICATION FILED MAY 19. I9I5.

L MM R h m m WHQ M 5 W i \R \w 7 W a x m M M KN N R n\ J. B. LEONARD.

HOLLOW BLAST BURNER FOR FURNACES.

APPLICATION mzo MAYIQ. 1915.

1,158,939. Patented Nov. 2, 1915.

2 SHEETS-SHEET 2.

view of a burner-section, I elevation of a plurality of burner-sections,

JOHN BIItCH LEONARD, OF MEMPHIS, TENNESSEE.

HOLLOW BLAST-BURNER FOR FURNACES.

Specification of Letters Patent.

Application filed May 19, 1915. Serial No. 29,159.

To all whom it may concern:

Be it known that 1, JOHN B. LEONARD, a citizen of the United States, residing at Memphis, in the county of Shelby and State of Tennessee, have iniented certain new and useful Improvements in Hollow Blast- Burners for Furnaces, of which the following is a specification.

My invention relates to improvements in hollow blast burners for furnaces.

An important object of the invention is to provide a burner of the above mentioned character, formed in upper and lower sections having air tight-connections with each other, which willpermit of the relative eX- pansion and contraction of the sections, while maintaining the joints air tight.

A further object of the invention is to provide a simple and efficient dump-door for normally closing the bottom of the hollow burner and retaining it substantially air tight, and adapted to reduce the friction between the engaging parts, to the minimum.

A further object of the invention is to provide a dump-door of the above mentioned character, inexpensive to manufacture, and durable.

A further object of the invention is to provide a burner of the above mentioned character, having its top provided with angularly and vertically arranged openings, discharging the air in divers directions, for effecting a complete and thorough combustion of the fuel.

A further object of the invention is to provide simple and reliable means to swing or move the dump-doors.

Other, objects and advantages of the invention will be apparent during the course of the following description. a In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same, Figure 1 is a side elevation of a' burner embodying my invention, parts thereof and the shell of the furnace being in section, Fig.2 is a plan Fig. 3 is an end assembled, taken on line 33 of Fig. 1, Fig. 4 is a transverse sectional view taken on line 4-4: of Fig. '2', Fig. 5 is a plan view of one of the burner plates removed, and, Fig. 6 is an end elevation of the same.

In the drawings,-wherein for the purpose ofillustration is shown a preferred embodiwhich is simple in construction,

ment of my invention, the numeral 10 designatesa furnace casing, as a whole, having a combustion chamber 11. Above the combustion chamber is a boiler 12, and below it, my improved burner 13. This burner is made up of a plurality of hollow blast lnn-ner-sectionsl l arranged side-by-side in spaced relation and having asbestos 13 or the like. arranged therebetween. Each lmrnensection comprises an upper portion 15, having a top 16, preferably inclined upwardly near its forward end, as shown at 17. The side walls of the portion'15 are provided at their longitudinal edges with grooves 17', preferably inverted V-shaped in crosssection, which are adapted to receive tongues 18, preferably V-shaped in crosssection and formed upon a co-acting lower portion 19. The forward end of the lower portion 19 is provided with a forwardly ex- Patented Nov. 2, 1915.

tending flange 20, engaging and supported a by a substantially Z-sh aped rest 21,- embedded in the front wall of the furnace, as shown. site ends closed, as shown.

Arranged between the forward end of the upper portion 14 and the forward wall of the furnace is a dead-plate 22, as shown. The rear end of the lower portion 19 is provided with a depending air chamber 23, preferably cast integral therewith. The chamber 23 serves as a rest for the rear end of the portion 19 and is provided at its lower end with a flange 24, arranged upon a brick air flue or duct 25, having air fed thereto. under suitable pressure through a pipe 2!), as shown.

As more clearly shown in Figs. 1 and 4, the lower portion'19 of the'burner section has its bottom open from its forward end to the air chamber 23,'such opening or opening bottom being normally covered b a dumpdoor 27. This dump-door is rigi 1y mounted upon a rod orerock-shaft 28, ournaled through bearings 29, attached to the lower end of the portion 19. As more clearly shown in Fig. 4, one edge of thedump-door 27 is transversely rounded for slidable engagement with the inwardly bulging por tion or fillet 30, having an inner beveled or inclined face 31. The upper surface of the dump-door 27, adjacent its opposite longitudinal edge engages with the lower rounded "edge 32 01 the opposite side of the por tion 19, asshown. Itis obvious that this construction provides means whereby the dump-door 27 may have a firm and close contact with the adjacent walls of the portion 19 of the burner for providing a substantial air tight union, the, rounded edges of the engaging parts preventing undue friction. When the ashes orv deposits accumulate upon the outer surface of the dump-door 27, it is swung to the inclined position, so that they readily slip off of it.

Rigidly connected with the forwa d ends of the rods or rock-shafts 28 are depending cranks 33, having pivotal connection, as shown at 34, with a reciprocatory bar 35. This reciprocatory bar is provided with an upstanding recess or opening 36, receiving and engaging a roller 37, connected with the upper end of a shifting crank 38. This "shifting crank 38 is rigidly mounted upon a rock-shaft 39, suitably journaled and extending through the forward wall ofthe furnace and having its outer end formed square in cross-section, for detachably receiving a key-crank 40 for turning it.

The top 16 of each burner-section is rovided with spaced pairs of longitudinal openings 41, between-the ends of which are arranged transverse openings 42. The openings 41 and 42 are preferably identical, and

each opening is substantially trapezoidal in transverse and longitudinal sections, with its side and end walls inclined or flaring up:- wardly. Arranged within each of these openings is a plate 43, disposed longitudinally or transversely of the top 16. Each plate 43 is trapezoidal in transverse and longitudinal sections and tapers downwardly, 1

and is substantially smaller in transverse and longitudinal dimensions than-the opening. Each plate 43'is provided with later-- ally extending lugs or members'fl l, preferably formed integral therewith, and having beveled ends 45, to engage'with the beveled Walls of the openings, whereby the plate is held. s aced from the walls of the opening, the endsof'the platebeing also spaced from the end wallso'f the opening, providin .a

preferably rectangular'air passage-13, is-

v sumption of the fuel.

Each plate 4:3- is provided with transverse opening or openings, receiving bolt or bolts 46, preferably arranged therein while the plates are being cast, such boltshaving connection at their lower ends with a transverse locking bar or bars 47, engaging beneath,

the top for clamping the plate in position.

In the use of the burner, the furnace may be. started without the employment of the forced draft, as suflicient air .will pass through the openings in the top 16, to permit'of the combustion of the coal or fuel,

for this purpose. \Vhen steam is gotten up,

an engine is driven which in turn drives a 'fa-n,.supplying air under suitable pressure,

into the hollow burner. This air passes vertically-.fithrough the openings- 48 and up wardly-at inclined angles through the openings 43'. v

It is to be understood that the form of my invention herewith shown and described is to be taken as'a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described the invention, I claim 1. In a hollow blast burner for a furnace, a hollow burner-section having an opening in its bottom and one side thereof rovided with, an interior vertically incline surface extending inwardly toward the lower end of the side, and a dump-door arranged within the opening in the bottom of the hollow burner-section and having one edge disposed to contact with the interior vertically in- Iclined surface of the hollow burner-section for increasing the-degree of contact between these elements as such edge is-moved downwardly toward the lower end of said inclined surface, said dump-door having its opposite edge portion arranged beneaththe opposite side of the hollow burner-section to side, substantiall .as described. v

2. In a hollow last burner, for. a furnace a hollow "burneresectionhaving an opening "contact with'the. lower end of such opposite in itswfbottom and one-; ide the1'eof' rovided with aninterior vertically incline surface extending inwardly toward thelower end of the si'deg'a dump-door arranged within the opening in the-bottom of the burner-section and extending-substantially throughout the entire 'length-of the opening with one edge thereof arranged to contact with the interior I verticallyinclined surface for increasing the degree of contact between these elements as such ad e is moved downwardly toward the lowerl'e d .of said inclined surface, said dump-door having its opposite edge a!"- 'ran'gedz'be'nea-th and projecting outwardly beyond. the lower end of the opposite side walk-of; the burner-section; and means to axis;-

1.3. In a hollow blast burner for a furnace;

swingthe dump-doonupon itslongitudinal a hollow burner-section having side walls with one side wall projecting downwardly beyond the other for a substantial distance and provided with an interior vertically inclined surface extendin inwardly toward the lower end of such si e wall, the opposite side vall having its lower edge rounded; a dump-door arranged within the open bottom of'thc burner-section between the side walls and extending substantially throughout the entire length of the open bottom said dump-door having one edge rounded and adapted to contact with the interior vertically inclined surface for increasing the degree of contact between these elements as such edge is moved downwardly toward the lower end of said inclined surface, said dump-door having its opposite ed e portion arranged beneath the rounded e5 Copies of. this patent may be obtained for five cents each, by addressing the "Commissioner Washington, D. (7.

go of the JtllCl side wall to contact therewith; and means to turn the dump-door upon its longitudinal axis.

l. In a hollow blast burner for a furnace; a hollow burner-section having a top provided with spaced pairs of longitudinally extending openings and transverse openings arranged alternately between the pairs of longitudinal openings; and plates arranged within the openings and spaced from the walls thereof for forming therewith upwardly discharging air passages.

In testimony whereof l allix my signature in presence of two witnesses.

JOHN BIRCH LEONARD.

\Vitnesses FRANK BLoMnEau, W. H. MADDEN.

of Patents. 

